| ORIGINAL ARTICLE |
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| Year : 2014 | Volume
: 2
| Issue : 3 | Page : 135-141 |
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Evaluation of efficacy of the MBT appliance in expressing inbuilt tip and torque values: Using torque angulation device
MB Raghuraj1, Vivek Amin2, Akhter Husain2, Rohan Mascarenhas2, Sandeep Shetty2
1 Department of Orthodontics and Dentofacial Orthopaedics, Dr. Syamala Reddy Dental College Hospital and Research Centre, Munnekolala, Marathalli (Post), Bengaluru, India
2 Department of Orthodontics and Dentofacial Orthopaedics, Yenepoya Dental College, Mangalore, Karnataka, India
Correspondence Address:
M B Raghuraj
Department of Orthodontics and Dentofacial Orthopaedics, Dr. Syamala Reddy Dental College Hospital and Research Centre, #111/1 SGR College Main Road, Munnekolala, Marathalli (Post), Bengaluru - 560 037, Karnataka
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/2321-3825.140684
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Objectives: Several studies on faciolingual inclination have been published and a few statistical investigations have been performed with regard to the preadjusted edgewise appliances, but there is lack of studies which have evaluated the inbuilt characteristics of the MBT preadjusted appliance. This retrospective study was conducted to evaluate the efficacy of the MBT appliance system in terms of expressing its inbuilt characteristics of tip and torque values. Materials and Methods: The study sample consisted of 30 subjects who received full fixed appliance treatment involving four 1 st premolar extractions using the MBT appliance. Pretreatment and posttreatment study models of these subjects were measured for the tip and torque using Torque Angulation Device. Treatment changes were analyzed statistically and the posttreatment measurements were compared with the MBT prescription values. Results: The posttreatment angulation and inclination values when compared with MBT prescription a mean difference of ±2.1° for the tip and ±11.9° for torque. Tip was almost fully expressed in all teeth except for the maxillary 2 nd premolar, 1 st molar, mandibular canine, 2 nd premolar, 1 st and 2 nd molar, where the discrepancy was more than 1°. Torque was under expressed in maxillary central incisor by 1.8°, 1 st molar by 1.5° and 2 nd molar by 11.9°. Torque was over expressed in maxillary lateral incisor by 2.1°, canine by 2.4° and mandibular central and lateral incisor by 4.9° and 4.6°, canine by 4.8°. Torque was sufficiently expressed in maxillary 2 nd premolar, 1 st and 2 nd molar and mandibular 2 nd premolar, with a discrepancy between 0.5°. Conclusion: Tip was almost fully expressed in all teeth except for the maxillary-2 nd premolar, 1 st molar, mandibular- canine, 2 nd premolar, first and 2 nd molar, where the discrepancy was only around 1°. Torque was sufficiently expressed in maxillary-2 nd premolar, 1 st and 2 nd molar and mandibular- 2 nd premolar, where the discrepancy was between 0° and 0.5°. Torque was under expressed in maxillary-central incisor, 1 st molar and 2 nd molar. Torque was over expressed in maxillary- lateral incisor, canine and mandibular-central, lateral incisor and canine. Deviation around the mean measurements was found for all the parameters in all teeth. Keeping in account of individual bracket positioning errors it would be fair to anticipate that MBT appliance would result in reasonably optimal tooth positioning at the end of the treatment without any manual archwire adjustments. Tip was comparatively better expressed when compared to torque. |
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